A system and method of packing an order. A first sequence of bins corresponding to orders is transported on a first conveyor to a packing station. A case for each order is constructed by a case forming system, the case forming system able to construct cases from blanks of various sizes. The cases are transported from the case construction apparatus to the packing station in a second sequence, wherein the sequential order of the cases corresponds to the bins in the first sequence. The bin in the first sequence are brought to the packing station with the cases in the second sequence.